Honestly? All she needs to do is retrieve ALL the deleted footage and Blackwell's emails and documents. She knows Blackwell is corrupt, so she just needs enough to out her.
If she cross-references the various deletions with what Blackwell is doing, she'll very quickly figure out that Blackwell is covering for a Ward.
While she COULD do this as part of a broader crackdown on shitty schools nation wide, she could stop as soon as she found out Sophia's a Ward and go public to expose a Ward engaging in attempted murder of a civilian.
Why? Because she could post it along something like:
"I had two projects. One was looking into the bottom 100 worst schools in America to out the corruption there, and the other was investigating schools in general to make sure they weren't taking advantage of Wards. (And, privately, alerting the Protectorate to leaks - I'm not a monster, and having met Legend before I'd rather have him in my corner that opposite it.)
Imagine my horror and disgust when those projects dovetailed. I actually had to dig into this because I honestly couldn't believe it when I saw it.
This'll probably make my work a little harder, but either the Protectorate is complicit in covering up a Ward's attempted murder of a child or they're so incompetent they let it happen. The perpetrator isn't just still there endangering other children, but wasn't even given a warning!
Legend, you're probably going to see this, I trust you to have good judgement, and this is apparently pretty close. Could you please go there and clean house?
For the rest of the Protectorate? This shot across the bow is your warning. For the sake of all the kids and other mothers out there, I am going to be dredging. If you don't want to be humiliated?
Don't focus on me, because you won't find me.
Don't try to hide it, because you can't hide anything from me.
Do clean up your messes, and admit your mistakes.
If I see good faith efforts to do things right? I send evidence your way.
If I see a coverup like I did here? I post it online, and maybe next time I don't bother to blur faces of mask voices. (Except kids, obviously. Again: Not a monster.)"
Bam. At the cost of needing to dig into the worst schools in America, and dig through the records of every school where there's a Wards program (Which she should be considering anyway), she would have a perfect explanation for why she would have this information (Fighting corruption, a stated goal), and why she would post it alone (It was so far beyond the pale, and children are in danger).